Preheat oven to 350 degrees
Brown your sausage or hamburger and onions together add any spices you want to give it flavor.
Spray some cooking spray in the bottom of a 9-13 inch metal pan or a glass dish can be used. Start with a layer potatoes, zuchinni, squash, onions and the browned meat mixture. Spread the can of tomato sauce on top and place in the oven for 45-50 minutes.

2

After 45-50 minutes stick a fork in to see if the potatoes on the bottom are done, if they are done top with shredded Mozzarella cheese, put the dish back in the oven till the cheese is completely melted (about 5-10,min.).
Take out the pan/dish and let it cool for about 20 minutes.